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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a594555f6e6c6108c5799e37fc045150944e00b86bf13cbecf90d277e2e6be49' 
  AND token = 'lTQK7DpnejqwpVt1yf8gflMQvZ/U41aHIstvfvEp7eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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