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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1890d3d78b1a157aeb91db450527288de2e9d5f15c32ec81c36ec353fb92e637' 
  AND token = 'zK/FTwsN118eXBlzWWvPS2FOpX/ZExZO+qKpwTC4zW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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