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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cb22df0ef4fe33d7dd3a0555323e6c795cc3a81fd40ac754c44064389f9c277' 
  AND token = 'FoJUl4RLZFtQt32Sfl6Df9NftOXHKoGz60HOLUWDSo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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