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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd42a905e9272e581f3db407ac0db0df1c7dd58f336114ad8f97f245df74507ec' 
  AND token = '8M3h6C89/KrOo4avRkhpqUGDeWzd+ALxkk6f/1aLynE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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