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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'accf99fe9ce03282062dfcdf113e98693b7c62a2cd714430899801ac4c1b1f70' 
  AND token = '6gfYEiPRQ+ZnJNQAJfbgXqIOBq9x9Vdf5y0Gk1x8Ccc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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