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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c63956da0196081505bca9af3d9b83a11aa597ba43e0fedb496604dafe5a303d' 
  AND token = 'HwQIV5Q061z2t2LIykU+1DryHaPQ5YYze5Zi77Q95+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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