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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52abed4207f4502f02683e7c9ec6e78733229c299fc9bb0843fb8332171800e5' 
  AND token = '3UMk3k5adyOEaJHYpt5nX4VJnWkHtvpSAC08iSW7Pfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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