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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cc507a5561a928890f39be8b8a95bffb26689596169549a9b04388f0c6f10a2' 
  AND token = '/BYLifIsxPYkcjs4T9GzEJHEJB1yClZkNDft0T0CrBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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