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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db584cd6a65cb08a1c05d73ed40d4c48cd07db316610435b5fa999555255286' 
  AND token = 'gVLXnyK0eMvztMH97hutod7V0sQpmwxdVInC01q0MeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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