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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9a08237be72b83d043b1dc4275275fd6c7eb01b9cfb6a06ba7da11d69bc51fb' 
  AND token = 'we2tPFuHzdaLVEZLPGJhsb54ZUKQdQHyVMmYeJhbPys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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