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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a20688b227cd2a365aa7d92bce0747b52a4bad10a33d46f7536489c7b0eca9fa' 
  AND token = 'EWC6A2lX0oFeiczWeazl1u9+t6BHje2FzNHRRq4f+tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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