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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3114fbb81316bc944e16d3cb9f3c302458bfecf93b2f6846e6b3839469106a28' 
  AND token = 'wUvAcNyyB6Ea6BQRJZLKPwh0vonSvnRDvq0bjwx0BAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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