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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '976ad7a41aeb4b9ebc156f29c5ab590a2affe01646d3174c8233698bd2af385d' 
  AND token = '/VWto+P+oMkXLUTYDvIddrfN54lOTGdvOelaCT8b/m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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