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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24bccf7e874092dae7701df51def9125a06299df02ea4fb9855bf388b2e43d8a' 
  AND token = 'EhotT/Q318hR/zFBMrspTQAlyt1m36YUzEoBUSjwVu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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