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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74b79df46cf8e1374bdf8c8ed2917a9726ee3c58ab38a7571a6a25eafc685357' 
  AND token = 'PNwuXMlBHBh3nDoWSq5wSe67Q6dflB5voC+8Muvo59k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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