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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3c661990c6ae9a7903d4492bc7acd4a64a83367c4f96a4aa5216ba5b3d42ac2' 
  AND token = 'giJB+0HXc1m0GnGyeDrw2fGHokjYZCGLT5XXbXQHU40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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