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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aa59b562bff7fe0fd8de888b0fe5934f343adaaccdc4a3991d5b53fac870f3f' 
  AND token = '1HOf4Gs32I5aUST76/ueFspJzEHeBthIe8A9eO21TR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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