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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ab20c5311c5c336c5e31e0471a0adfe90e45b1935d17a0c63ac5def7dfcbb1a' 
  AND token = 'QsmdBrdtePtJQpd2A9Nqvjfq5ap6u5P8Kx2fvPh6W0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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