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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77bc9f1bcc2c4259519c62e716dce7db82b1c911c43346df0fb65522f2e7abdf' 
  AND token = '4zn5ouDz8Lhe8b5tUsgNOYjkrC0Vy0GXwNgXQkcAZUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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