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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce656e6c8c49889457415119ac6c62e13e59a26c157ffbf9dfe0cd73140300a9' 
  AND token = 'KlOBVTbTwzdPfcxrBEyzF6nAehiZfxXKblD7NtwX2mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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