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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e5a1bf00150ba98bf9e958555bb030e067a7f736c1e21a4fee8c30233370a35' 
  AND token = '1OGkXMp/t33nOsMybP6V9MSzL5Ddl94JaEgSdjWaNzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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