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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f4661283ebe308b1d1e1d4ff72e017eefe411dcf199ba040137b446a72e0b34' 
  AND token = 'BlwrCxmoaIyAdjvQTF3tHVODdF2JsubFYsHcrrQ8Sjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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