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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd67d31e0985edd5f98f73078b1c40aff2a534322d83e6ec194fb7052f987f94' 
  AND token = '3FVKDooihg2D6ijVR/Z+DO2DG9Nd8Gb6GkGRM9GtRNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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