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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77705c79da19d05f63ea3ff8c407071afd1e98c12259be570882115d8d609a08' 
  AND token = 'TbTDGM7gXRiW88NajpyCMVO1MTH55v+BexbMGS8PVYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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