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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ad92de888b289d78ffaff7a7747a64ef1314308db12149af37fd67975896136' 
  AND token = 'LboV31WNKr+Ul+H3Whm78u6Jjf9gGun9g50rnKKOFg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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