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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '330969a5848dacf1196b109c8e14bab6b031955c6c6d342b7bb9b200ac3e237e' 
  AND token = 'r6CozRE66kwii74uIQsmZloP8Q7+mhvYVI+yOnWGUvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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