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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0e52065316167010b44512f39ede8970032841678babd59499d6ddc959a5d4c' 
  AND token = 'B5OJODXjpdQ9i2TivPIsFT6XIT9JLLmdCrEySaTXbko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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