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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7068b21bfbe2973b3fb6abe9fbad7fda4679388a70e2c60ef423d19b695146e' 
  AND token = 'KqA1rj1Gb7UFEJjY4t+rcNyzkseSpHJCoUwc0Z8NacU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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