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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e07cd69ab8715f7ad4887fc36ff9f134ed25e037bfff9b6d458c77835a3c81fb' 
  AND token = '9WlcV7rX50KMiSJRw6z4QkaekVs2KckYxUJeGcxWKZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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