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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e075a8be0293268ca2330d8e7f223b4c29baf206e96b43eef05b6390b260fde' 
  AND token = 'QTeUDlflqhQ/eSPSg7/ItHss1rDD6hrcnEsbGo+nkw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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