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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57f835dc12b761e2e02245d2f812a8a26a7b86de5d76386f4ef25fa8742cb5da' 
  AND token = 'uzAe3qROtfC6C1aOQEjLkx0oGX7O+L7RMWW4J4j8I7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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