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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '740eb8b9c1872f24d6abda8a764c5554a890eae5c404f145c687098c135dd56b' 
  AND token = 'KqVsjRYkO0g/xQEZk0ZAK8EjRUfgI49H9ECQP6OCSTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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