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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9684858d57f04835fcf2b661d965746bc5604bf895c1b6d18438fc7a567cd353' 
  AND token = 'gbXngNPOCDFn5rfnre6EAILFbi+SZLrImNjCbErOva8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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