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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b03ffe98606f3e20e88d2d75fe739bd1130dfae254ccf742d5a84d067cc63ca' 
  AND token = 'ywhpIoiIsp4hMnmJXwWD6mhNdXHCH2N+yi0vfz9YT2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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