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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6577f5c320df1ad96c18ebd9ffafd7423e1282ef39483d4f3eef3e6bb8f52bf' 
  AND token = 'uyCuNsBCQI5UVdBGc96Q4ylGfA5rtgeIfzqrMgbl+ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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