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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a47d423491dcf6772b69e4c291be2fc2d200c9fcd49defdec2607a9d9b228e36' 
  AND token = 'LD32SHioJIPrLnlwQ3lf94RE27KRJO5ByE1HcbG4EyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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