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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f490118a94fc3a09ce3c6171e5396033b99fcfa2ad8713d5e1523ce805f78f9' 
  AND token = 'I9fELS6kscs+2geC/KCfCzKCb+8PX2DrJR3zblIWRNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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