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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c033222c0131a9aac9e6a6c18127c4c4900ab40c5efca82aa55e41c3561c658f' 
  AND token = 'sU/KvApRUQtf0arqXrbcOTd406ggDhX4RViSWfwMb8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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