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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eb724348a6af0c56a10937bf87eee93271d6a3fdedb9c003aea0ed59ac6d6c2' 
  AND token = '4eeE4IfHavicd/wHc3fuupA0u+3pCwNKUAzfCyuMJ8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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