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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aba8bb9270899673c9628e8dd68843c3195aae2038e373c4900f18fa550965ca' 
  AND token = 'hFPVyf57Cz8dICClLTrnhUnHGRRbIWoD5XQVYWfK6nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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