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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b89a25aeaf67181b93dfac50033ab7dd7871e798faa11e61df1b75c480fb461' 
  AND token = 'GtFQGCRecKfz5W5w45/8SSweRDAozhpi58Hq7Di90/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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