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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26ba46b61d6d24003a65b2bf458959886fc78bf02eec0b3633842c3e1af33420' 
  AND token = 'qHVrI1at6fjiy7Jq2rN63GulFxsD6V+Ew6RSto2RTWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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