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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dce82905b381fc16bd60f1f869d46ed1e6eefe0b3aa9605be6ce75ade07422ed' 
  AND token = 'sHIjbAc6PWU24zpzybpGTjrvaw7IZhg5ceHBC98ka08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}