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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd83fdc977e267c61c0cc83d3afbfac392c45a18d35c4940517e5f04a3ea512f1' 
  AND token = 'LzlEGsr3EKaffctocpRemD7o5X+/DbgShaNKXP1z6pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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