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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fc01d0fdf92d007c918d71e5110c8af6c5bd939ab144a228a0414ad5c899cbb' 
  AND token = 'DfDeJGjg0ilxyZZqOb1p9SNlCxE41D662/BJ1k/ADcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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