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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '930c469566659c7e16189917a3d6049ed057b86ecceea0ef80954307435883fc' 
  AND token = 'J2NUg7THoZXHDiFTljOCqlQy6vDfA3XrpKcgzFhiWYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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