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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5933006b49b829c61735c8d90f0465e10ce2200920754fbdac1fed7ce96905d6' 
  AND token = 'OUIpsROKy8SdoN4c39H1UVakwVyrC1x7FTGkdSp/76A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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