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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a91d5a65872aba03f8ff232916c8f80e494606997328a5e95c290b332f4d3745' 
  AND token = 'y5PqlgfDvExRrcC16m+RTcRvrHobuS/8298yx9gVuao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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