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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '402486742db5b8400ab156f5e3ff6533611c7b9779621389892d4cd44460f403' 
  AND token = 'ag12bNP+42Kb6yAgLV2GpFw6Mh5OntQ5I96GTLpNd6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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