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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9f439f9c9c9ab4d06ba7f14245b07dd7ce66ce7abb25f4eec49daabee5324c8' 
  AND token = 'Fpj/n6xWVtc6+sJtAmZ10SMvssWXvhSe5jF9GHMlGCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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