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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '709917178e8781639968b3db4603f5412ede34f3b808161fea99a5088ff07621' 
  AND token = '5WXeqvtp9IauEGo0QwO9C/fxrHg/ZKGkn4Q2uFqwqoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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