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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60dfbda45524394195ce388b8a552452a53ae6edb3e0b15b7378f4d96be1de86' 
  AND token = 'Zcn4U3fZO1Fj3k/X4yFOas8MaWPaZwyldYhmAQzAXSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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