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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '404d75c421d68118b05a697dd3e88b4d51374f8283bdce454b52ad688fe688f3' 
  AND token = 'wgYYdBN3ClcFyCdTj941cSG67ymQnuLwyG5u91cVGcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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