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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee80a03f4b209835420cf9756529fdb4e1dd6d48b531c985c303ba8d3a854c9d' 
  AND token = 'PgzWLRUFGycY8TxSc6C8bORTRkSWKi/XZvRzcguCjM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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