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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89d91aa873e2b7c770763bd2a0c322b0c653b3c3a6eb13e62306f6cb42b6d4ba' 
  AND token = 'AiVt82gUh9l/pvogltHAhaD63Uwd/BGJ/8ieu6I2Mws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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