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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69c2eb7dd65a5b867e023b8a0922971dd75c446a4ee93a58fcbbcae950ca17f2' 
  AND token = 'rme7q9PMkMzhYPLiHbdKNDv5ozqZoVX3aFw5aGpDmG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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