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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05c0ce0996ce6b99c54d17199420da97e7e708b2f079ad707e16aab2edba0693' 
  AND token = 'bpg//bDOTflI2JDgNq4t0244fxZFOKibHUyFsOoU8Dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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