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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03dd9f530889b299f06332717456a742e44dcd8b14e5c291255832a333f23c57' 
  AND token = '5189v4dtdOfHK6sxCEf276gnOdGleDuQxsk/u/FePtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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