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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34003a4c506bd95c6d263dc808a80b0635bfd07dcd129443f985b6a94459b99a' 
  AND token = 'uDhwgAf/k6t26AfX+WQo4tLUru1TdXlwpxhJH9efHL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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