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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '540f350889e985002ffe36f8896f570a6a7cb2f8b4044f3b84138aad5b11e88f' 
  AND token = 'Tu5oNusKakdxyX9AvoLZgvbryeod5eV9mgluSaPLBS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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